only for the people in them. actually, i feel like they could be if you knew what you were doing. but its a needlessly large vehicle and, as such, i think a lot of people who get behind the wheel may not be able to drive it as easily and well as other vehicles. other than that along with the horror stories about flipping over, etc, im not sure how much less safe it would be than any other vehicle.
i think most of the danger lies in the behavior of the drivers who feel that they are either 1. safer and can drive slightly more lax or 2. in a larger car so they can drive how they want. im not sure its concious but if i bought a car and felt super-safe in it, i may start driving with abandon.